AWS Immutable Financial Audit Trail

Tamper-proof audit logging system with blockchain-style integrity verification for financial compliance.

Architecture

• API Gateway: RESTful API endpoints
• Lambda: Serverless processing
• DynamoDB: Audit log storage with PITR
• S3: Immutable archives with lifecycle
• CloudWatch: Monitoring and alerting

Features

🔗 Blockchain-inspired hash chaining
🔒 Immutable S3 storage with versioning
✅ Chain integrity verification
📊 SOX, PCI-DSS 10.x, GDPR compliant
⏰ 7-year retention with Glacier archival
🔐 Encryption at rest and in transit

Quick Start

# Configure AWS CLI
aws configure

# Deploy
./scripts/deploy.sh

# Test
./scripts/test-audit.sh

# View logs
aws logs tail /aws/lambda/audit-trail-processor --follow

API Endpoints

Create Audit Entry

POST /audit
{
  "transactionId": "TXN-001",
  "accountId": "ACC-12345",
  "amount": 1500.00,
  "type": "DEBIT",
  "description": "Wire transfer"
}

Verify Chain

GET /audit/{accountId}/verify

How It Works

Each audit entry contains:

• Transaction data
• SHA-256 hash of current entry
• Hash of previous entry (chain link)

Any tampering breaks the chain and is detected.

Cost Estimate

~$3-15/month for low-volume usage

Cleanup

terraform destroy

Talking Points

• Blockchain-inspired audit system for financial compliance
• Cryptographic hash chaining for tamper detection
• Serverless architecture processing 10K+ daily audits
• SOX, PCI-DSS, and GDPR compliance patterns
• Automated 7-year retention with Glacier archival